Posters

SmartSurface T-PRK vs Femto-LASIK in moderate myopia. Changes in higher-order ocular aberrations at 6 months postop

Poster Details

First Author: M.Bohac CROATIA

Co Author(s):    I. Gabrić   K. Gabrić                 

Abstract Details

Purpose:

To determine if there is a statistically significant result in visual acuity and amount of higher-order ocular aberrations between these 2 types of laser refractive surgery types.

Setting:

University Eye Hospital 'Svjetlost', Zagreb, Croatia

Methods:

Patients (40 per group) underwent unremarkable T-PRK (group I) or FemtoLASIK (group II) using Schwind Amaris 750S laser. The higher order ocular aberrations (HOAs) were measured objectively using SCHWIND PERAMIS – 2-in-1 topography and aberrometry (SCHWIND eye-tech-solutions GmbH, Kleinostheim, Germany) at pre-and 6months postoperative in each case. The HOAs evaluated using this aberrometer were coma, trefoil and spherical aberration (SA) for pupil sizes of 3mm and 6mm and total HOA amount. The difference between pre-and post-op values (y) were compared with pre-op values (x) using standard linear regression.

Results:

Preop, there was no significant difference between groups I&II in relation to either each of the three HOAs or required sphero-cylindrical correction. Linear regression revealed some significant findings (from right eyes only in bilateral cases) for the 6mm pupil. The significant relationships between the changes of individual HOA values (y) and pre-op HOA values (x) were as follows. Group I coma y = 0.621x-0.109(r=0.409, p=0.025) and SA, y = 0.689x-0.002 (r=-0.498, p=0.005) and Group II trefoil, y = 1.045x-0.068 (r=0.869, p<0.001) and SA, y = 0.884x-0.013 (r=0.952, p<0.001).

Conclusions:

The numerical indices of the linear expressions show that changes in magnitude of specific HOAs can be predicted on an individual case-by-case basis for both T-PRK and FemtoLASIK.

Financial Disclosure:

None